CN110535334A - Three-phase multiple power frequency isolation type photovoltaic grid-connected inverter - Google Patents
Three-phase multiple power frequency isolation type photovoltaic grid-connected inverter Download PDFInfo
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- CN110535334A CN110535334A CN201910940666.8A CN201910940666A CN110535334A CN 110535334 A CN110535334 A CN 110535334A CN 201910940666 A CN201910940666 A CN 201910940666A CN 110535334 A CN110535334 A CN 110535334A
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- 238000002955 isolation Methods 0.000 title abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 30
- 230000006698 induction Effects 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 238000004804 winding Methods 0.000 claims description 72
- 238000000034 method Methods 0.000 claims description 24
- 230000033228 biological regulation Effects 0.000 claims description 22
- 230000005611 electricity Effects 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 2
- 230000002411 adverse Effects 0.000 abstract description 2
- 230000004907 flux Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract 4
- 238000010586 diagram Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The embodiment of the invention discloses a three-phase multiple power frequency isolation type photovoltaic grid-connected inverter which comprises a first photovoltaic array, a second photovoltaic array, a first direct current side voltage stabilizing capacitor, a second direct current side voltage stabilizing capacitor, a first three-phase voltage type inverter bridge, a second three-phase voltage type inverter bridge and a novel isolation type transformer based on an induction filtering technology, wherein the first direct current side voltage stabilizing capacitor is connected with the direct current sides of the first photovoltaic array and the first three-phase voltage type inverter bridge, and the second direct current side voltage stabilizing capacitor is connected with the direct current sides of the second photovoltaic array and the second three-phase voltage type inverter bridge. The invention not only can replace the function of an LC filter, but also can effectively eliminate harmonic flux in the iron core of the transformer compared with the traditional scheme of adding an LC filter device system; therefore, the quality of the electric energy of the secondary grid-connected side of the transformer can be improved, and the adverse effect of harmonic waves on the transformer can be restrained.
Description
Technical field
The present invention relates to power electronics control technology field more particularly to a kind of multiple power frequency isolated form of three-phase are grid-connected
Inverter.
Background technique
With the rapid development of our country's economy, the consumption structure of urban and rural residents constantly upgrades, and resource contradiction is prominent, therefore opens
It is most important to steady economic development to send out new energy, improvement energy resource structure.It relies life to solve energy crisis and the protection mankind
The environment deposited, finding new energy becomes present matter of utmost importance.Solar energy, wind energy, tide energy etc. belong to reproducible
Clean energy resource.Solar energy has the advantages such as inexhaustible, cleaning, easy to maintain, so the multiple power frequency isolated form photovoltaic of three-phase is simultaneously
Net inverter becomes the hot spot of current research.
However it is non-linear due to inversion device, the direct current of photovoltaic array is by caused by after DC/AC converter
Harmonic pollution can reduce the reliability and service life of the multiple power frequency isolated form photovoltaic combining inverter of three-phase.Conventional method is
LC filter is connected after DC/AC inverter to inhibit harmonic pollution caused by inverter.Light is able to suppress using filter
The various harmonic waves in inverter are lied prostrate, can effectively solve to wait the humorous of different capacities grade photovoltaic DC-to-AC converter from small-power to high-power
Wave pollution problem.But in many occasions, the capacity of filter is very big, this will increase the cost and volume of system, while also band
Energy loss additionally is carried out.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that it is grid-connected to provide a kind of multiple power frequency isolated form of three-phase
Inverter, so as to reduce cost, volume and energy consumption.
In order to solve the above-mentioned technical problem, it is grid-connected to propose a kind of multiple power frequency isolated form of three-phase for the embodiment of the present invention
Inverter, including the first photovoltaic array, the second photovoltaic array, the first DC side electric capacity of voltage regulation, the second DC side electric capacity of voltage regulation,
One three-phase voltage type inverter bridge, the second three-phase voltage type inverter bridge, the novel isolated transformer based on induction filtering technique, the
One DC side electric capacity of voltage regulation is connected with the DC side of the first photovoltaic array and the first three-phase voltage type inverter bridge, the second DC side
Electric capacity of voltage regulation is connected with the DC side of the second photovoltaic array and the second three-phase voltage type inverter bridge, the first three-phase voltage type inversion
The exchange side of bridge and the exchange side of the second three-phase voltage type inverter bridge are respectively and based on the novel isolated change for incuding filtering technique
First group of depressor is connected with second group of primary side winding, the vice-side winding of the novel isolated transformer based on induction filtering technique
External three-phase main-frequency AC network.
Further, the novel isolated transformer based on induction filtering technique is made of three stems, Mei Gexin
Primary side winding and a vice-side winding there are three being set on column；Each winding is mutually indepedent, and each winding turns ratio is N1:N2:N3:N4=1k 1:
1.73k 1:1.73k 2: 1, wherein N1、N2、N3、N4Respectively based on induction filtering technique first group of primary side of isolating transformer around
Group the number of turns, the second primary side group umber of turn, third group primary side winding the number of turns, vice-side winding the number of turns,k 1For isolated transformer
Former vice-side winding turn ratio,k 2For induction Filter Winding and vice-side winding turn ratio；Novel isolation based on induction filtering technique
First group of three primary side winding star connection of formula transformer, second group of three primary side winding triangle junction, third group three
Primary side winding triangle junction, three vice-side windings constitute star connection, the every phase of third group primary side winding and one group of concatenated filter
Wave capacitor is connected with filter inductance, three groups of concatenated filter capacitors and filter inductance star connection, constitutes induction filter.
Further, the first DC side electric capacity of voltage regulation and the second DC side electric capacity of voltage regulation are identical by two sizes
Bulky capacitor composition.
Further, the first three-phase voltage type inverter bridge, the second three-phase voltage type inverter bridge are all carried out simultaneously by three bridge arms
Joining, each bridge arm is connected by two controllable devices, and each controllable devices are equipped with antiparallel uncontrollable device, and
And the three-phase voltage of the first three-phase voltage type inverter bridge, the second three-phase voltage type inverter bridge output has 30oPhase difference.
Further, the first photovoltaic array and the second photovoltaic array shape size are identical, and capacity is identical.
The invention has the benefit that the present invention can not only replace the effect of LC filter, but also add LC with traditional
Filter system schema is compared, the harmonic flux that the present invention can effectively in eliminating transformer iron core；It not only can mention
The power quality of high transformer pair side and net side, and harmonic wave can be inhibited to the adverse effect of transformer.
Detailed description of the invention
Fig. 1 is the circuit structure diagram of the multiple power frequency isolated form photovoltaic combining inverter of three-phase of the embodiment of the present invention.
Fig. 2 is the winding construction figure of the novel isolated transformer based on induction filtering technique of the embodiment of the present invention.
Fig. 3 is the circuit diagram of the first operation mode of the three-phase voltage type inverter bridge of the embodiment of the present invention.
Fig. 4 is the circuit diagram of second of operation mode of the three-phase voltage type inverter bridge of the embodiment of the present invention.
Fig. 5 is the circuit diagram of the third operation mode of the three-phase voltage type inverter bridge of the embodiment of the present invention.
Fig. 6 is the circuit diagram of the 4th kind of operation mode of the three-phase voltage type inverter bridge of the embodiment of the present invention.
Fig. 7 is the circuit diagram of the 5th kind of operation mode of the three-phase voltage type inverter bridge of the embodiment of the present invention.
Fig. 8 is the circuit diagram of the 6th kind of operation mode of the three-phase voltage type inverter bridge of the embodiment of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
It mutually combines, invention is further described in detail in the following with reference to the drawings and specific embodiments.
If directional instruction (such as up, down, left, right, before and after ...) is only used for explaining at certain in the embodiment of the present invention
Relative positional relationship, motion conditions etc. under one particular pose (as shown in the picture) between each component, if the particular pose is sent out
When raw change, then directionality instruction also correspondingly changes correspondingly.
If in addition, the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and should not be understood as
Its relative importance of indication or suggestion or the quantity for implicitly indicating indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.
FIG. 1 to FIG. 2 is please referred to, the multiple power frequency isolated form photovoltaic combining inverter of the three-phase of the embodiment of the present invention includes first
Photovoltaic array 1, the second photovoltaic array 2, the first DC side electric capacity of voltage regulation 3, the second DC side electric capacity of voltage regulation 4, the first three-phase voltage
Type inverter bridge 5, the second three-phase voltage type inverter bridge 6, the novel isolated transformer 7 based on induction filtering technique.
The DC side phase of first DC side electric capacity of voltage regulation 3 and the first photovoltaic array 1 and the first three-phase voltage type inverter bridge 5
Even, the second DC side electric capacity of voltage regulation 4 is connected with the DC side of the second photovoltaic array 2 and the second three-phase voltage type inverter bridge 6, the
The exchange side of one three-phase voltage type inverter bridge 5 and the exchange side of the second three-phase voltage type inverter bridge 6 are respectively and based on induction filtering
First group of the novel isolated transformer 7 of technology is connected with second group of primary side winding, based on induction filtering technique it is novel every
The external three-phase main-frequency AC network of vice-side winding from formula transformer 7.
Please refer to FIG. 1 to FIG. 2, as an implementation, based on induction filtering technique novel isolated transformer 7 by
Three stems composition, sets that there are three primary side winding and a vice-side windings on each stem.As shown in Figure 1, on three stems
Winding is respectively a1、a2、a3, a, b1、b2、b3, b, c1、c2、c3,c.Winding a1、a2、a3, a, be located at same stem on, winding b1、
b2、b3, b, be located at same stem on, winding c1、c2、c3, c, be located at same stem on.Each winding is mutually indepedent, each winding turns ratio
For N1:N2:N3:N4=1k 1:1.73k 1:1.73k 2: 1, wherein N1、N2、N3、N4Isolation respectively based on induction filtering technique becomes
First group of primary side winding the number of turns of depressor, the second primary side group umber of turn, third group primary side winding the number of turns, vice-side winding are (i.e. in Fig. 1
A, b, c) the number of turns,k 1For the former vice-side winding turn ratio of isolated transformer,k 2For induction Filter Winding and vice-side winding the number of turns
Than.
First group of three primary side winding (i.e. a in Fig. 1 of novel isolated transformer 7 based on induction filtering technique1、
b1、c1) star connection, second group of three primary side winding (i.e. a in Fig. 12、b2、c2) triangle junction, three primary sides of third group around
Group (i.e. a in Fig. 13、b3、c3) triangle junction, three vice-side windings constitute star connections, the every phase of third group primary side winding with
One group of concatenated filter capacitor is connected with filter inductance, three groups of concatenated filter capacitors and filter inductance star connection, constitutes sense
Filter is answered, the function of filtering out harmonics may be implemented.That is primary side winding a1、b1、c1Constitute star connection, anode
It is connected respectively with the right end of first group of inverter bridge, primary side winding a2、b2、c2Angular connection is constituted, anode is inverse with second group respectively
The right end for becoming bridge is connected, primary side winding a3、b3、c3Angular connection is constituted, anode is connect with external filter respectively.This
Embodiment uses isolated transformer, and there are electrical isolations on transformer former and deputy side, so that transformer safety with higher
Property.
The present invention is coupled using transformer secondary winding △/Y eliminates low-order harmonic electric current, the every phase of third group primary side winding
It is connected respectively with concatenated filter capacitor and filter inductance, the function of filtering out harmonics may be implemented.
The embodiment of the present invention inhibit harmonic wave concrete principle be；
The present invention is different from conventional double transformer with split windings only comprising two primary side windings and a vice-side winding, is filtered based on induction
The novel isolated transformer 7 of wave technology adds additional a Filter Winding, specially connects filter.In Fig. 1,C as,C bs,C cs, the three phase capacitance of the additional filter of the isolating transformer third group primary side winding respectively based on induction filtering technique,L as,L bs,L csThe three-phase electricity of the additional filter of isolating transformer third group primary side winding respectively based on induction filtering technique
Sense.L as,L bs,L csWithC as,C bs,C csRespectively filter equivalent inductance and equivalent capacity.Its winding connection be Y/ △/
△/Y connects winding by Y and △ connects winding phase shift 30o, offset ± 1 subharmonic of 6n that inverter bridge generates.Filtering skill is incuded simultaneously
The application of art is so that constitute zero impedance access in inside transformer, by ± 1 subharmonic of 12 n of DC/AC converter inflow transformer
It can be drawn by confluence and from Filter Winding, external filter is cooperated to realize the function of filtering out harmonics.
As an implementation, the first DC side electric capacity of voltage regulation 3 and the second DC side electric capacity of voltage regulation 4 are by two
The identical bulky capacitor composition of size, so that the left end electricity of the first three-phase voltage type inverter bridge 5, the second three-phase voltage type inverter bridge 6
Basic pulse free is pressed, and the first DC side electric capacity of voltage regulation 3 and the second DC side electric capacity of voltage regulation 4 can play buffering quadergy
Effect.As shown in Figure 1, capacitor of the first DC side electric capacity of voltage regulation 3 by upper endC 11With the capacitor of lower endC 12Composition, the second direct current
Side electric capacity of voltage regulation 4 by upper end capacitorC 21With the capacitor of lower endC 22Composition.CapacitorC 11, capacitorC 12, capacitorC 21And capacitorC 22's
Capacitance size is identical.
As an implementation, the first three-phase voltage type inverter bridge 5, the second three-phase voltage type inverter bridge 6 are all by three
Bridge arm is formed in parallel, and each bridge arm is connected by two controllable devices, each controllable devices be equipped with it is antiparallel not
Controllable devices, and keep the first three-phase voltage type inverter bridge 5, the second three-phase voltage type inverse using PWM synchronous modulation control mode
Becoming the three-phase voltage that bridge 6 exports has 30oPhase difference.Three-phase voltage type inverter bridge circuit reliability of the invention is high, is applicable in
In large-power occasions.As shown in Figure 1, three bridge arms of the first three-phase voltage type inverter bridge 5 are respectively by controllable devices V11With it is controllable
Device V14, controllable devices V13With controllable devices V16, controllable devices V15With controllable devices V12It is connected in series.Controllable devices V11, can
Control device V14, controllable devices V13, controllable devices V16, controllable devices V15With controllable devices V12Upper play a reversed role respectively is associated with diode
D11, diode D14, diode D13, diode D16, diode D15With diode D12.The three of second three-phase voltage type inverter bridge 6
A bridge arm is respectively by controllable devices V21With controllable devices V24, controllable devices V23With controllable devices V26, controllable devices V25With it is controllable
Device V22It is connected in series.Controllable devices V21, controllable devices V24, controllable devices V23, controllable devices V26, controllable devices V25With it is controllable
Device V22Upper play a reversed role respectively is associated with diode D21, diode D24, diode D23, diode D26, diode D25With diode D22。
In Fig. 1,i a1、i b1、i c1To flow into the three-phase current based on the first group of primary side winding of isolating transformer for incuding filtering technique,i a2、i b2、i c2To flow into the three-phase current based on the second group of primary side winding of isolating transformer for incuding filtering technique,i as、i bs、i csFor
The three-phase current of the isolating transformer third group primary side winding based on induction filtering technique is flowed out,i a、i b、i cTo flow into three-phase work
The three-phase current of frequency power,u a,u b,u c, it is three-phase mains voltage.
As an implementation, the first photovoltaic array 1 is identical with 2 shape size of the second photovoltaic array, and capacity is identical, can
To provide direct current energy in varying degrees according to the variation of solar irradiance.First photovoltaic array 1 and the second photovoltaic array 2
Pass through the grouping formed in parallel and serial to convert solar radiation into the photovoltaic power generation battery of direct current.
Illustrate present embodiment, the multiple work of three-phase of the invention below with reference to Fig. 1, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8
The circuit operation mode of two groups of three-phase voltage type inverter bridges of frequency isolated form photovoltaic combining inverter is as follows:
Whenωt∈(0o-60o) when, circuit operation mode is as shown in Figure 3；
Whenωt∈(60o-120o) when, circuit operation mode is as shown in Figure 4；
Whenωt∈(120o-180o) when, circuit operation mode is as shown in Figure 5；
Whenωt∈(180o-240o) when, circuit operation mode is as shown in Figure 6；
Whenωt∈(240o-300o) when, circuit operation mode is as shown in Figure 7；
Whenωt∈(300o-360o) when, circuit operation mode is as shown in Figure 8.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention are defined by the appended claims and their equivalents.
Claims (5)
1. a kind of multiple power frequency isolated form photovoltaic combining inverter of three-phase, which is characterized in that including the first photovoltaic array, the second light
Photovoltaic array, the first DC side electric capacity of voltage regulation, the second DC side electric capacity of voltage regulation, the first three-phase voltage type inverter bridge, the second three-phase electricity
Die mould inverter bridge, the novel isolated transformer based on induction filtering technique, the first DC side electric capacity of voltage regulation and the first photovoltaic battle array
Column and the DC side of the first three-phase voltage type inverter bridge are connected, the second DC side electric capacity of voltage regulation and the second photovoltaic array and the
The DC side of two three-phase voltage type inverter bridges is connected, and the exchange side of the first three-phase voltage type inverter bridge and the second three-phase voltage type are inverse
Become bridge exchange side respectively with based on incude filtering technique novel isolated transformer first group and second group of primary side winding
It is connected, the external three-phase main-frequency AC network of vice-side winding of the novel isolated transformer based on induction filtering technique.
2. the multiple power frequency isolated form photovoltaic combining inverter of three-phase as described in claim 1, which is characterized in that described based on sense
It answers the novel isolated transformer of filtering technique to be made of three stems, is set on each stem there are three primary side winding and a pair
Side winding；Each winding is mutually indepedent, and each winding turns ratio is N1:N2:N3:N4=1k 1:1.73k 1:1.73k 2: 1, wherein N1、N2、N3、
N4Respectively based on induction first group of primary side winding the number of turns of isolating transformer of filtering technique, the second primary side group umber of turn, the
Three groups of primary side winding the number of turns, vice-side winding the number of turns,k 1For the former vice-side winding turn ratio of isolated transformer,k 2For induction filtering
Winding and vice-side winding turn ratio；First group of three primary side winding star of novel isolated transformer based on induction filtering technique
Shape is coupled, second group of three primary side winding triangle junction, the three primary side winding triangle junctions of third group, three vice-side windings
Star connection is constituted, the every phase of third group primary side winding is connected with one group of concatenated filter capacitor and filter inductance, and three groups concatenated
Filter capacitor and filter inductance star connection constitute induction filter.
3. the multiple power frequency isolated form photovoltaic combining inverter of three-phase as described in claim 1, which is characterized in that described first is straight
Stream side electric capacity of voltage regulation and the second DC side electric capacity of voltage regulation are made of the identical bulky capacitor of two sizes.
4. the multiple power frequency isolated form photovoltaic combining inverter of three-phase as described in claim 1, which is characterized in that the first three-phase electricity
Die mould inverter bridge, the second three-phase voltage type inverter bridge are all formed in parallel by three bridge arms, and each bridge arm is by two controllable devices
Part is connected, and each controllable devices are equipped with antiparallel uncontrollable device, and the first three-phase voltage type inverter bridge, second
The three-phase voltage of three-phase voltage type inverter bridge output has 30oPhase difference.
5. the multiple power frequency isolated form photovoltaic combining inverter of three-phase as described in claim 1, which is characterized in that the first photovoltaic battle array
Column are identical with the second photovoltaic array shape size, and capacity is identical.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114093625A (en) * | 2021-10-29 | 2022-02-25 | 东北电力大学 | Hybrid intelligent distribution transformer containing power frequency isolated back-to-back converter |
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| CN210405078U (en) * | 2019-09-30 | 2020-04-24 | 深圳古瑞瓦特新能源股份有限公司 | Three-phase multiple power frequency isolation type photovoltaic grid-connected inverter |
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| CN114093625A (en) * | 2021-10-29 | 2022-02-25 | 东北电力大学 | Hybrid intelligent distribution transformer containing power frequency isolated back-to-back converter |
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